https://www.harborfreight.com/26-gal...sor-69669.html
Calls for a 20-30 gal 4.0 cfm @ 90 compressor. Plus you get 20% off at HF with coupon.
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Sandlapper BMWCCA #481069
07 e90 6AT, Cobb V3 protuned by Motiv, Aquamist HFS-4, DCI, ER CP/Tial BOV, AA DPs, AA Sport Intercooler, 19" BBS CH-R, Pure Stage 2 Turbos